SERVNSA parameter
Non swappable server areas
Summary
- Default value
- 0
- Parameter type
- User
- Where set
- On User 0's parameter line
- Related products
- All
- Introduced
- Model 204 V7.4
Description
The SERVNSA parameter, along with the SERVNSSZ parameter, control non-swappable server areas that are placed above the 2G bar.
Each server table to be allocated above the bar is controlled by a bit in SERVNSA; if the bit is on, the corresponding server table is allocated above the bar.
The bits are:
| Bit | Server table placed above the bar |
|---|---|
X'02000000' | FTBL |
X'00800000' | GTBL — requires version 7.5 or later of Model 204. |
X'00004000' | NTBL — requires version 7.5 or later of Model 204. |
X'00002000' | QTBL — requires version 7.5 or later of Model 204. |
X'00080000' | STBL — requires version 7.6 or later of Model 204. |
X'00040000' | VTBL — requires version 7.6 or later of Model 204. |
SERVNSSZ (server non-swappable size) is the amount of space in bytes required for the above-the-bar server tables per user. The total amount of storage allocated for non-swappable server areas equals SERVNSSZ rounded to 4 K and multiplied by NUSERS. When sizing SERVNSSZ, it should accomodate the largest non-swappable table sizes that might be needed.
In Model 204 7.5 and later, QTBL and NTBL can alternatively be placed above-the-bar in a swappable area. This can be indicated with the SERVGA and SERVGSZ parameters. The bits corresponding to NTBL and QTBL should not be set in both SERVNSA and SERVGA – if they are, an error message will be issued and the online will fail to come up.
The SERVNSA parameter is new in version 7.4 of Model 204.
For more information about server tables above the bar, see the Rocket Model 204 System Manager's Guide.